DTC U0131: F-CAN Malfunction (ECM/PCM-EPS Control Unit)

NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ).

Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
Check for Pending or Confirmed DTCs with the HDS.
Are DTC U0029 and U0131 indicated at the same time?

YES -Go to the troubleshooting for DTC U0029 (see DTC U0029: F-CAN MALFUNCTION (BUS-OFF (ECM/PCM)) ).

NO -Go to step 3.
Clear the DTC with the HDS.
Check for Pending or Confirmed DTCs with the HDS.
Is DTC U0131 indicated?

YES -Go to step 5.

NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the EPS control unit, and the ECM/PCM.
Check for communication the EPS system with the HDS.
Does the HDS communicate with the EPS control unit?

YES -Go to step 6.

NO -Go to the symptom troubleshooting for EPS indicator does not go off, and no DTCs are stored (see SYMPTOM TROUBLESHOOTING ).
Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
Jump the SCS line with the HDS.
Disconnect EPS control unit connector D (28P).
Disconnect ECM/PCM connector A (49P).
Check for continuity between ECM/PCM connector terminal A48 and EPS control unit connector D (28P) terminal No. 1.

Fig 1: Checking Continuity Between ECM/PCM Connector Terminal A48 And EPS Control Unit Connector D (28P) Terminal No. 1
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES -Go to step 11.

NO -Repair open in the wire between the ECM/PCM (A48) and the EPS control unit, then go to step 12.
Check for continuity between ECM/PCM connector terminal A49 and EPS control unit connector D (28P) terminal No. 15.

Fig 2: Checking Continuity Between ECM/PCM Connector Terminal A49 And EPS Control Unit Connector D (28P) Terminal No. 15
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES -Substitute a known-good EPS control unit (see EPS CONTROL UNIT REMOVAL/INSTALLATION ), then go to step 12 and recheck. If DTC U0131 is not indicated, replace the original EPS control unit (see EPS CONTROL UNIT REMOVAL/INSTALLATION ), then go to step 12.

NO -Repair open in the wire between the ECM/PCM (A49) and the EPS control unit, then go to step 12.
Reconnect all connectors.
Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
Reset the ECM/PCM with the HDS.
Do the ECM/PCM idle learn procedure (see PCM IDLE LEARN PROCEDURE ).
Check for Pending or Confirmed DTCs with the HDS.
Is DTC U0131 indicated?

YES -Check for poor connections or loose terminals at the EPS control unit and the ECM/PCM, then go to step 1.

NO -Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the INDICATED DTC'S TROUBLESHOOTING .